The Swan Nebula (Messier 17)
Alluna Optics RC16 with AFFR (F6.0) Paramount PMEII
QHY600m + SBIG STi autoguider,
AstroDon 50mm 5nm h-alpha 20x 2 minute exposures.
Calibration with MaxImCCD, registration and stacking Pixinsight
Copyright Peter J Ward 2021